/////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Tencent is pleased to support the open source community by making behaviac available.
//
// Copyright (C) 2015 THL A29 Limited, a Tencent company. All rights reserved.
//
// Licensed under the BSD 3-Clause License (the "License"); you may not use this file except in compliance with
// the License. You may obtain a copy of the License at http://opensource.org/licenses/BSD-3-Clause
//
// Unless required by applicable law or agreed to in writing, software distributed under the License is
// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and limitations under the License.
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////

namespace behaviac
{
	class RandomGenerator
	{
        private static RandomGenerator Instance = null;
		public static RandomGenerator GetInstance()
		{
            if (Instance == null)
            {
                Instance = new RandomGenerator(0);
            }
			return  RandomGenerator.Instance;
		}

		//[0, 1)
		public float GetRandom()
		{
			m_seed = 214013 * m_seed + 2531011;
			float r = (m_seed * (1.0f / 4294967296.0f));

			Debug.Check(r >= 0.0f && r < 1.0f);
			return r;
		}

		//[low, high)
        public float InRange(float low, float high)
		{
            float r = this.GetRandom();
			float ret = r * (high - low) + low;
			return ret;
		}

        public void SetSeed(uint seed)
		{
			this.m_seed = seed;
		}
	
		protected RandomGenerator(uint seed)
		{
            m_seed = seed;
		}

		~RandomGenerator()
		{}

		private uint m_seed;
	};
}